CVE-2026-51538

Published Jul 13, 2026 CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Description
EIPStackGroup OpENer 2.3.0 (commit 76b95cf) suffers from an Incorrect Access Control vulnerability in its handling of encapsulation sessions. When the server processes critical encapsulation commands, it verifies whether the provided session_handle exists in the global session list, but it fails to verify whether that handle belongs to the specific TCP connection issuing the request. Because there is no strong binding between a session handle and its originating socket, any attacker on the network can use a valid session handle created by another legitimate client to bypass access controls.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Opener Project
Opener Project opener
CPEs cpe:2.3:a:opener_project:opener:2.3.0:*:*:*:*:*:*:*
Vendors & Products Opener Project
Opener Project opener
Type Values Removed Values Added
Title Session Handle Access Control Bypass in EIPStackGroup OpENer
Type Values Removed Values Added
Title Session Handle Access Control Bypass in EIPStackGroup OpENer
Type Values Removed Values Added
Title Insufficient Session Binding Enables Unauthorized Access in EIPStackGroup OpENer 2.3.0
Type Values Removed Values Added
Title Insufficient Session Binding Enables Unauthorized Access in EIPStackGroup OpENer 2.3.0
Type Values Removed Values Added
Weaknesses CWE-284
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Eipstackgroup
Eipstackgroup opener
Vendors & Products Eipstackgroup
Eipstackgroup opener
Type Values Removed Values Added
Description EIPStackGroup OpENer 2.3.0 (commit 76b95cf) suffers from an Incorrect Access Control vulnerability in its handling of encapsulation sessions. When the server processes critical encapsulation commands, it verifies whether the provided session_handle exists in the global session list, but it fails to verify whether that handle belongs to the specific TCP connection issuing the request. Because there is no strong binding between a session handle and its originating socket, any attacker on the network can use a valid session handle created by another legitimate client to bypass access controls.
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Jul 14, 2026, 1:13 PM
Reserved
Jun 8, 2026, 12:00 AM
Status
Analyzed
Published
Jul 13, 2026, 10:16 PM
Modified
Aug 11, 2026, 4:38 PM